Diesel pile driver for impact atomization

ABSTRACT

A Diesel pile driver, in which a piston operable to impact upon the impact area of an impact member atomizes the fuel conveyed by a metering pump onto the impact area of the impact member, the impact surface of said piston and the impact area of said impact member which is adapted to receive the fuel from said metering pump respectively forming plane surfaces substantially parallel to each other.

United States Patent 11 1 Kiimmel et al.

[11] 3,747,693 1451 July 24, 1973 DIESEL PILE DRIVER FOR IMPACT ATOMIZATION- Inventors: Fritz Kiimmel, Esslingen; Rudolf Hennecke, Buoch-Grunbach, both of Germany Assignee: Delmag-Maschinenfabrik Reinhold Dornfeld, Esslingen, Germany Filed: Aug. 13, 1971 Appl. No.: 171,524

Foreign Application Priority Data Aug. 18, 1970 Germany P 20 40 924.9

U.S. c1. 173/12s, 123/46 sc, 123/46 11,

I j o y 7 '173/137 .1111. 01 E0211 7/12 Field of Search 173/128, 135, 137;

123/46 SC, 46 H [56] References Cited UNITED STATES PATENTS 2,093,634 9/1937 Cordes 173/137 X 2,758,575 8/1956 Wampach 2,740,385 4/1956 I-Iaage 173/135 X Primary Examiner-Ernest R. Purser Attorney-Walter Becker [57] ABSTRACT A Diesel pile driver, in which a piston operable to impact upon the impact area of an impact member atomizes the fuel conveyed by a metering pump onto the impact area of the impact member, the impact surface of said piston and the impact area of said impact member which is adapted to receive the fuel from said metering pump respectively forming plane surfaces substantially parallel to each other.

2 Claims, 2 Drawing Figures DIESEL PILE DRIVER FOR IMPACT ATOMIZATION The present invention relates to a Diesel pile driver for impact atomization. The invention is based on a pile driver for impact atomization according to which a piston at its impact atomizes the fuel conveyed by a measuring pump to the impact surface of the impact element.

With these heretofore known Diesel pile drivers employed for decades, the impact surface of the impact elements has been designed as a pan because the opinion prevailed that the fuel meted out by a measuring pump and not yet atomized had to collect on the bottom of said pan in order to be atomized eventually from the impacting piston by means of its ball-shaped end face shaped in conformity with the shape of the pan.

In this connection the art has put up with the fact that the manufacture of such ball-shaped surfaces requires expensive work and that when these ball-shaped surfaces wear, restoring the said ball shape can be carried out only by highly skilled workers and sometimes only by the manufacturer of the ram. Also in operation, certain disadvantages have been put up with. These disadvantages are due to the fact that the unavoidable play of the piston and also of the impact member or element in the cylinder produce certain lateral offsetting and eccentricities. These, in their turn, reduce the efficiency of the atomization. Furthermore, this lateral offsetting and causing of eccentricities bring about an undue wear on the ball-shaped surfaces whereby the degree of atomization of the impact atomization will be decreased further. Moreover, these eccentric impacts give rise to considerable transverse forces on the entire ram which forces, if breakage is to be avoided require a particularly strong design for the ram. It may be men tioned in this connection that a Diesel pile driver com prising a ram and a reciprocable Diesel hammer in conformity with terminology used in the patent literature is designated a Diesel pile driver.

It is an object of the present invention so to design a Diesel pile driver of the above general type that the fuel will have imposed thereupon a component of movement which distributes the fuel practically over the entire impact surface of the impact member.

This object and other objects and advantages of the invention will appear more clearly from the following specification, in connection with the accompanying drawing, in which:

FIG. 1 illustrates a longitudinal section taken along the line I l of FIG. 2, said section being taken through the lower portion of the Diesel pile driver, and showing a certain phase of the working cycle of the Diesel pile driver.

FIG. 2 is a cross section taken along the line [I I] of FIG. 1.

The present invention starts with the surprising findingthat the fuel in not yet atmoizedrcondition is distributed over a plane surface within the short available time, to such an extent in a moistening manner over the entire plane impact surface that also in such an instance the impact atomization can be realized by means of piston and impact member with plane end surfaces.

Referring now to'the drawing in detaiLin the particular example shown in the drawing, that phase of operat ing the Diesel pile driver is shown during which an impact member 13 rests on the upperend face of the pole 11 to be driven into the ground, while the lower end of the Diesel pile driver cylinder 12 rests upon the impact member 13. It is in said cylinder 12 that the impact member is guided, which latter has a plane upper end face or impact area 13.1 and also has a circular groove 13.2. Upon this plane end face 13.1 of the impact member 13, there will impact the lower end face or impact surface 14.1 of the Diesel pile driver 14 which moves downwardly from the illustrated position. This end face 14.1 is surrounded by a conical incline 14.2 The annular cylinder chamber which is left free by the. incline 14.2, will, together with the annular groove 13.2 of the impact member, form an annular compression chamber when the end faces 13.1 and 14.1 engage each other, said end faces 13.1 and 14.1 acting as impact surfaces.

After the fuel has previously been atomized by the plane surfaces 13.1 and 14.1 impacting upon each other, the fuel is radially centrifuged into said annular chamber, which fuel has been applied in the form of a moistening film to the impact surface 13.1. In view'of the pressure prevailing in this compression chamber, the atomized fuel will be able to combust. In view of the explosion-like increase in pressure the piston 14 is thrown up again.

The outside of cylinder 12 has associated therewith a metering device 18 for metering out the quantity of fuel required for each individual combustion operation. A fuel measuring pump associated with said measuring device 18 is so designed and arranged that the fuel in the form of a not yet atomized jet will be conveyed into the cylinder at an instant at which the inner space of the cylinder at a corresponding position of the piston 14 will by opening a nonillustrated air admission and combustion gas exhaust offer practically no or only slight over pressure. The admixing device has a double lever 16 having its arm 16.1 extending into the inner chamber of the cylinder 12, and with all these parts is arranged below the piston 14 occupying its upward position. The double lever 16 is pivotally mounted on the cylinder and will have its other arm 16.2 engaging the upper end 17 of the nonillustrated piston pertaining to the metering pump arranged at the circumference of cylinder 12. According to the showing of FIG. 1, the upwardly moving piston 14 has, by means of its circumference, moved the arm 16.1 of this double lever 16 out of the cylinder chamber and has pivoted the entire double lever 16. During this pivot movement, the other arm 16.2 has, by means of the piston end 17, pressed the piston of the metering pump downwardly. Consequently, the fuel is in a predetermined quantity conveyed in the form of a closed jet 20 through a passage 19 onto the impact curface 13.1 of the impact member 13. Jet 20 will at an incline, at a pointA impact upon said surface 13.1. The impact area A is offset from the center of the surface toward the metering pump, and the jet 20 is so inclined that the impacting fuelwill on the plane impact surface 13.1 have imposed thereupon a component of movement by means of which from said pointA the fuel jet in the form of an expanding thin film 15 will be distributed toward the circumference of the surface 13.1.With such distribution, the impact surfaces 13.1 and 14.1 impacting uponeach other will bring about aparticularly fineatomi'zation of the fuel. 1

The feeding line for the fuel and the above men'- tioned inlet and outlet slots for fuel and scavenging air and combustion gas have not been shown in the drawing, inasmuch as the arrangement thereof is well known in the art.

It is, of course, to be understood that the present invention is, by no means, limited to the particular showing in the drawing, but also comprises any modifications within the scope of the appended claims.

What we claim is:

1. A Diesel pile driver exclusively for operation with the principle of impact atomization of fuel supplied in unatomized condition at low pressure, which includes: cylinder means, an impact member guided in said cylinder means, and having an impact area, a piston having an impact surface and being reciprocable in said cylinder means and also being operable to have its impact surface impact upon said impact area of said impact member having a face surface upon which unatomized fuel is applied by pump dosage for resulting in atomizing fuel conveyed to the impact area of said impact member, said impact surface of said piston and said impact area of said impact member respectively forming entirely flat plane surfaces substantially parallel to each other.

2. A pile driver according to claim 1, which includes: a metering pump associated with said cylinder means, and control lever means operable by said piston for controlling said pump, said cylinder means being provided with conduit means communicating with said pump and having its axis inclined toward-the axis of said cylinder means so that the point of intersection of the axis of said conduit means with said impact area will in the innermost position of said impact member in said cylinder means be offset in a direction radially outwardly of the axis of said impact member. 

1. A Diesel pile driver exclusively for operation with the principle of impact atomization of fuel supplied in unatomized condition at low pressure, which includes: cylinder means, an impact member guided in said cylinder means, and having an impact area, a piston having an impact surface and being reciprocable in said cylinder means and also being operable to have its impact surface impact upon said impact area of said impact member having a face surface upon which unatomized fuel is applied by pump dosage for resulting in atomizing fuel conveyed to the impact area of said impact member, said impact surface of said piston and said impact area of said impact member respectively forming entirely flat plane surfaces substantially parallel to each other.
 2. A pile driver according to claim 1, which includes: a metering pump associated with said cylinder means, and control lever means operable by said piston for controlling said pump, said cylinder means being provided with conduit means communicating with said pump and having its axis inclined toward the axis of said cylinder means so that the point of intersection of the axis of said conduit means with said impact area will in the innermost position of said impact member in said cylinder means be offset in a direction radially outwardly of the axis of said impact member. 